docs: update README to include TypeScript implementation and installation

[hzhangxyz]

Summary
This PR updates the README.md to reflect that DDSS is implemented symmetrically in both Python and TypeScript. Previously, the documentation only focused on the Python version.

Changes

• Dual-Language Support: Explicitly mentioned the availability of both Python and TypeScript implementations in the introduction.
• Module Mapping: Updated the Modules section to include both .py and .ts file paths for all components (Input, Output, DS, Egg, etc.).
• Installation Guide: Added a new section for the TypeScript version, providing instructions for using npx (recommended) and npm.
• Usage Consistency: Clarified that the command-line interface, options, and interactive syntax are identical across both implementations.

Verification

• Verified that the new installation commands (npx @hzhangxyz/ddss) align with the package.json configuration.
• Ensured all file paths correctly point to existing files in the repository.

close #46